Automatic stoker



5,1.. HARTJ 'AUTQMAUOSTOKEH. z i AAPPLICATION FILED MAY 26. i917.

` Patented Aug. 5,1919;-

4 SHEETS-SHEET 1 :rE-@Em :2:21:

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Edwin j Huf/LTI;

E. 1. HART.

AUTOMATIC STOKER.

APPLICATION FILED MAY 26.191?.

m6111811 Aug. 5, 1919;

4' SHEETS-SHEET 2.

5.1. HMH.. AUTOMATIC soKER. 'APPLICATION FILED MAY 26. 1917'.

Patented Aug. 5, 1919.

4 SHEETS-SHEET 3.

5.1. HART.'

AUTOMATIC STOKER.

APPLlCATlON FILED ram/26,1911.

Patented Aug. 5, 1919.

4 SHEETS -SHEET 4.

' tion.

EDWIN J. HART, OF PlIILADLPHIA, PENNSYLVANIA.

4nuronrn'rro sToKER..

I' Specnca-tion of Letters Patent.

i Patented aug.. 5, raie.

applicati@ med mi 26.1917. serial Natures?.

To4 all whom z't may concern: l

Be it known that .1', EDWIN J. HART, a

citizen of the United States, residing -a-t' Philadelphia,'in the countyof Philadelphia I* and State of Pennsylvania,fhave invented certain newand useful Improvements in 1 lAutomatic Stokers, of which the followingis a specification.

My invention consists of an improved au tomatic Stoker. One object of myinvention is't'o provide a Stoker including a fuel-injecting pusher,means for raising the injected fuel to the grate bars, and means foractu-.

ating the grate bars, and to operate all of said elements .directly froma reciprocable cross head.

Another object is to lso make the connection of said elements to saidcross head that they will be of simple construction and can be quickly.and easily attached and detached.

A further object isto provide improved meansfor varying" the amount ofmovement of the' grate bars. l

A still further object is to provide an improved construction andarrangement of fuel injecting passage and receiving trough .wherebythejamming of the fuel is prevented and an even movement of the fuel iSinsured.

-These objects, and other .advantageous ends which will bedescribedhereinafter, I attain in -the following manner, reference being had tothe accompanying drawings' in which- Figure 1 shows a sectionalelevation of 1 my improved Stoker, said Section being taken Fig. 2 is atransverse Section of my improved Stoker taken on the line 2452 of' Fig.1.

Fig. 3 is an enlarged transverse Section taken on the line 3-8 of Fig. 1and showing my improved cross head and certain of the elements which areactuated directly-therefrom.

Fim 4 is a fragmentarv sectional plan viewttaken on the line 4-4 of Fig.3.-

Fig. 5 is a top plan view of my improved cross head.

Fig. Gis a front elevation of Fig. 5. p Fig. 7 is an end elevation ofthe cross head. i

cam arm which forms a part of my vinven- 'pusher 9 under the hopper Fig.8 is a top plan view of an adjustable Fig. 9 is a section on the line9-9 of Fig. 8. l .Y i

Fig. 10 is a fragmentary perspective view Showing a modification ofcertain of theele ments ofI my invention.'

Referring to the drawings, 1 represents the wall of a furnace having acasing 2 set therein, said casing having a sleeve portion B whichfits'an opening within the wall 1 and flared Fig. l.

This casing 2 provides a fuelinjecting passage 4 which has a hopper 5leading thereto. The casing 2adjacent the inner surface ofthe wall l,has a depending portion 6 which forms a drop from the fuell injectingpassage4 to a trough 7 'which extends longitudinally 'through thefurnace. This trough has its sides flared upwardly as clearly shown inFig. 2 and each Side terminates in a flange 8 at the top thereof.

A fuel injecting pusher 9 is designed to slide upon the bottom Surfacevl() of the pase linwardly as clearly shown in -sage 4 and is Secured toaplate 11, a block` .12 being interposed between the plate 11 and saidpusher, it being noted'that the end 13 of the bottom of said passage 4terminates forward of the block 12 which permits a sliding movement ofSaid fuel injecting 5 to push fuel` which is fed therethrough -into theinner portion of the passage 4 and eventually into the'trough 7 in amanner hereinafter morefully described.

-T he plate l11 has aV depending fork 14` which has prongs spaced aparttoembrace x the outer end of arod 15 which isslidably movable through ahole 16 inthe depending portion 6 of the casing 2. The rod 15 movesVlongitudinally within the trough 7 and has 95 secured theretofuelraising members 17 onlyA one of which is illustrated in the drawing,

lbut it will be understood that thenumber of these members 17 will vary'in proportion to the length of the furnace and may be spaced apart atdesirable intervals.

A cross head 18 has an upwardly projecting fork 19, the prongs of saidfork being'y designed to embrace the outer end of the rod 15, togetherwith the fork 14 on the plate '11. Nuts 20 and .21 on the rod 15 aredesigned to engage the forks 14 `and 19 respectively. Guide bars 22 and23 are mounted in sui-table bearingssupported by thepasing 2, and onythese guide bars slide the'cross i head 18, it being noted that. saidcross head -ihas lugs 23,a and 24rthroughwhich said guide -anadjustingrod 34 which has two worms 35 and 36' secured thereto. 'llhe worm 35 islo,n

cated between the bifurcations of the arrn32 arm 41.

Each cam arm 41 has a-segmentA 42 ing andthe worm l36 is located betweenthe bif4 furcations ,of the arm 33.

'A hand lever 37 is secured to said rod 34 so that the latter Vcan berotated for a purf pose hereinafter described. Pivot holes 38 and 39 areformed in the opposite ends' of the cross head 18,l and through each ofthese pivot holes extends a pivot pin 40 which depends from anvmijustable `cam or cam i cluding a row of teethf'43 designed toen-`gage with a respective worin'35 or36 as clearly show ni-n Fig. 4,itbeingnoted that the teeth 43 are arranged in an arc concentric'withthe pivotalaxes' of the pivot pins so'that by rotation of the worms 35and 36, the cam arms 41 will be swungA on their pivot 'pins 4() linopposite directions. y i' It will be [noted: that the pitch of the.;v`worms 35 and 36extene'li'n opposite directions, so that. by rotatingthe rod 34, the arms 41 vwill b e silnultaneously rotated inopposite-directions.

ln Figs, l to 9 inclusive, the arms 41 have elongated vslots 44 infwhich are tted bushings 45. Rocking arms 46 land 47 have their lower endportions designed to. extendwithinthe slots in the cam arms j A41.4These rocking arms 46-and 47 arefsecured respec-v tivelyto rock-shafts48 and 49, 'l`he rock shafts have extensions 50 designed to fit withinrecesses independing portions 51 on grate bars 52, so that when the'arms 46 and 47 are rocked, thef grate bars "52 j will also be movedlongitudinally to a'gitate'the fuel carried'thereby. i

llt will vbe noted that other grate bars 53 are provided which, asillustrated, alternate Vwith the grate bars 52 and thesegrate bars 53are not movable, but on the contrary 'have lipsv `54 which entend withingrooves 55 inthellanges'8 at the tops et' the trough 7.v

lilyturning the cam arms 41, through the medium of the hand lever 37 andworms 35 and 36 so that the slots are positioned at an angle' asillustrated in Fig. 4, it will be noted the cross head 16 is moved lintosaid compartments 76 will longitudinally of the furnace, theA arms 4 6and 47 will be oscillated to rock the rock shafts 48 and 49 and..thereby actuate thev grate bars 52.- Theextent of this rocking movementcan be varied by changing the angular positions of the cam arms/41.-ilhis can be easily done bv`rotating the adJustin bearings 56, and 57respectively,'thelatter being positioned at the tops of walls 58and 59.vThese walls are supported upon a base 60,including 'an air-inletjpassage 61 which communicates with a space between the walls 58'and 59.` 'Openings 62 and 63are provided. vin the walls 58- and59, 'andthese openings can `be closed'by doors'64 and 65.

- Each; of the doors 64 and 65 `has an arm 66 connected. thereto'and'ythese arms 66 are pivotally connected to a toggle lever 67 which `-ispivotally supported on a bracket 68, A

handoperatedrd 69 ispivotally connected 'to the toggle lever 67 andextends to the outer portion of the casing 2'where it is 'providedrwith'a handle 70 sov that by movement ofthe rod' 69 longitudinally, the doors64 and 65 will be moved on their hinges 71 into/ an open or closedposition accordingto the direction of movement of said rod 69.

' 'Chambers 72 and? 73 are provided below the Ygrate bars'at the outsideof said vwalls 58 and 59. Each of the grate bars 52 and 53 hasapartition 74 which divides the grate.

bar in to two separate compartments ancl v7,6 (see'Fig. 2). Thepartitions 74 are positioned above the rock shafts 48 and 49 so that thepartitions, the rock shafts, l'and the walls, serve to is'plate thechambers 72, 73, and compartments 7 5A of the ygrate bars from thecompartments 7 6 Iand the spacebetween the walls 58' and 59, so .thatair passing up- Wardty between the walls 58 and 59 cannot pass to theci'nnpartments` 75 other than through. the openings 62and 63 and thisamount of openlng can be regulated by the position of the doors 64' and65,

, The portions of-.the grate bars providing the `compartments 76 areIperforated as shown at 77, s o that all of theairpassing ass'voutwardly through the perforations 7 into the fuel as it is raised fromthe trough 7 onto iis the :tops -of the grate bars. The portion ot v theVair: which passesthrough the openings 62 and ,1,63 willenter thecompartments 75 A and pass outwardly through pertorations 78 in the fuelsupporting tops of the grate bars whichv are shown in an inclinedstepped.

form inthe accoI-npanying drawings. 1

The amount ot air passing upwardly thronghthe inlet passage-61 can beregulated by a damper 79 which has a screw-thread ed lng .80 into whichfits threadedportioir of a rotatable rod '181,V said rod extending 4theouter portion ot the casing 2 and is pro- :ist

vided with a hand lever 82 whereby the rod 81 can be rotated and thedamper 79 will be caused to travel across the top of the inlet passage6l to control the amount of air passing upwardly between the`Walls 58and 59. t will vthus be understood that with my improved stoker, thecross head 18 directly controls the movement of the fuel injectingpusher 9, the fuel raising 'members 17 and rod l5, and means foractuating the grate bars. Furthermore, the construction of the severalparts is such that they may be connected or disconnected from theoutside of the casing.

In operation, the piston rod 27 reeipro# cates the cross head 18 and thefuel injecting pusher 9 pushes the fuel along the passage 4 and into thetrough 7 vAt the same time, the rod l5 is reciprocated by the cross head18 to agitate the fuel within the trough 7 and to raise it to the toplevel of the grate bars. Simultaneous with this action, the cani arms 4llwhich are mounted on the cross head 1S are reciprocated, and bytheangular disposition of the slots 44, the rocking arms 46 and 47 effect.the movement of the grate bars.

In the form of my invention shown in Fig. 10, instead of having thelower end of the rocking lever 46 extend directly into engagement withthe adjusting cam arm, Iv

provide a block 83 which slides within the slot in the cam'arm. erablymade in two sections 84 which are recessed to receive the lower end ofthe rocking lever 46, thus insteadV of having the wear come directly onthe end of the rocking lever, the block 83 will wear and can be quicklyreplaced from time to time.

lVhile VI have described my invention as takinga particular form, itwill be understood that the various parts of my invention may be changed`without departing from the The block 83 is -pref' spirit thereof, andhence I do not limit myself to theprecise construction set forth,but'consider that'I am at liberty to make such changes and alterationsas fairly come within the scope of the appended claims.

Having thus described my invention, what I claim as new and desire tosecure by Letters Patent is: l A i l. The combination in a stokerofiaplurality of sets of grate bars; rock shafts adapted to respectivelyrock grate bars of each set, a cross head, adjustable cams on said crossheadand adapted to oscillate the respective rock shafts due to thereciproca* tion of the cross head, said cams having rows of teeththereon, a common adjusting rod, and worms on'said adjusting rod forrespective engagement with the teeth of said cams for simultaneouslyadjusting said cams when the adjusting rod is actuated, substantially asdescribed.

2. The combination in a Stoker,- of grate bars, a reciprocable crosshead, a .rock shaft operative to actuate said grate bars, an arm on saidrock shaft, a worm, a cam movably mounted on lsaid cross head and havingworm teeth meshingwith said worin, said cam having a portion adapted toeffect the movement of the arm on said rock shaft to actuate the gratoswhen the cross head is reciprocated, said cam being operated by themovement of said worm to change the angular position of said port-ionVto vary the oscillating movement of said arm, substantially asdescribed.

In testimony whereof I have signed my name to this specification in thepresence of two subscribing witnesses.

EDWIN J. HART.' y

Witnesses:

JOSHUA R. H. Po'r'rs, CHAs. E. Po'rTs.

